An electronic device including a projection unit, an ambient light sensor and a processing unit is provided. The projection unit has a projection lens fixed on a side surface of the electronic device. The ambient light sensor is fixed on the side surface of the electronic device. The processing unit is configured to: control an average brightness of a screen projected by the projection unit as a first brightness value, and control the ambient light sensor to sense to derive a first measured brightness value; control an average brightness of the screen projected by the projection unit as a second brightness value, and control the ambient light sensor to sense to derive a second measured brightness value; calculate an ambient contrast ratio according to the first measured brightness value and the second measured brightness value; and adjust a projecting setting of the projection unit according to the ambient contrast ratio.
Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. An electronic device, comprising: a projection unit, having a projection lens fixed on a side surface of the electronic device, the projection unit projecting a screen through the projection lens; an ambient light sensor, fixed on the side surface of the electronic device; and a processing unit, coupled to the projection unit and the ambient light sensor, and configured to: control an average brightness of the screen projected by the projection unit as a first brightness value, and control the ambient light sensor to sense to derive a first measured brightness value; control the average brightness of the screen projected by the projection unit as a second brightness value, and control the ambient light sensor to sense to derive a second measured brightness value, wherein a difference between the first brightness value and the second brightness value is bigger than a first threshold; calculate an ambient contrast ratio according to the first measured brightness value and the second measured brightness value; and adjust a projecting setting of the projection unit according to the ambient contrast ratio; continuously deriving a monitored brightness value through the ambient light sensor; and when a variation of the monitored brightness value is bigger than a second threshold, re-calculating the ambient contrast ratio according to the monitored brightness value; when the variation of the monitored brightness value is bigger than the second threshold and a variation of the average brightness of the screen is bigger than a third threshold, the processing unit re-calculates the ambient contrast ratio according to the monitored brightness value and the variation of the average brightness.
An electronic device adjusts its projected screen settings based on ambient light. It has a projector with the lens on the side, an ambient light sensor also on the side, and a processor. The processor first sets two different brightness levels for the projected screen and measures the ambient light at each level using the sensor. Based on these two ambient light readings, it calculates an ambient contrast ratio. It then adjusts the projector's settings using this ratio. If the ambient light changes significantly (exceeds a threshold), the contrast ratio is recalculated using the new ambient light reading. If both the ambient light and the screen brightness change significantly, the contrast ratio is recalculated considering both changes.
2. The electronic device of claim 1 , wherein: the processing unit determines a scenario according to the ambient contrast ratio, and adjusts the projecting setting of the projection unit according to the scenario.
The electronic device, as described with a projector, ambient light sensor, and processor calculating and adjusting projection settings based on ambient contrast ratio and brightness value differences, determines a display scenario (e.g., "dark room," "bright room") based on the calculated ambient contrast ratio. It then selects and applies a pre-configured set of projector settings (gamma, saturation, contrast) optimized for that specific scenario, further refining the projected image quality based on environmental conditions.
3. The electronic device of claim 1 , wherein: the projecting setting of the projection unit comprises gamma, saturation and/or contrast ratio.
The electronic device, as described with a projector, ambient light sensor, and processor calculating and adjusting projection settings based on ambient contrast ratio and brightness value differences, adjusts the projector's image quality by changing at least one of these settings: gamma (adjusts brightness of midtones), saturation (adjusts color intensity), or contrast ratio (adjusts the difference between the brightest and darkest parts of the image). This allows fine-tuning the image to match ambient conditions.
4. The electronic device of claim 1 , wherein: the processing unit obtains a variation of an output brightness of the projection unit according to the variation of the average brightness and a gamma value of the projecting setting, and calculates to derive the ambient contrast ratio according to the variation of the output brightness and the monitored brightness value.
The electronic device, as described with a projector, ambient light sensor, and processor calculating and adjusting projection settings based on ambient contrast ratio and brightness value differences, calculates a change in the projector's light output based on the change in average screen brightness and the projector's current gamma setting. It then uses this calculated light output change, along with the ambient light reading, to recalculate the ambient contrast ratio. This allows the system to more accurately compensate for both changes in screen brightness and ambient light.
5. A method for adjustment of a projecting screen, adapted for an electronic device having a projection unit, the method comprising: controlling an average brightness of a screen projected by the projection unit as a first brightness value, and sensing to derive a first measured brightness value; controlling the average brightness of the screen projected by the projection unit as a second brightness value, and sensing to derive a second measured brightness value, wherein a difference between the first brightness value and the second brightness value is bigger than a first threshold; calculating an ambient contrast ratio according to the first measured brightness value and the second measured brightness value; adjusting a projecting setting of the projection unit according to the ambient contrast ratio; continuously deriving a monitored brightness value through the ambient light sensor; when a variation of the monitored brightness value is bigger than a second threshold, re-calculating the ambient contrast ratio according to the monitored brightness value; and when the variation of the monitored brightness value is bigger than the second threshold and a variation of the average brightness of the screen is bigger than a third threshold, re-calculating the ambient contrast ratio according to the monitored brightness value and the variation of the average brightness.
A method for adjusting a projected screen's settings on an electronic device involves initially projecting the screen at two different brightness levels and sensing the ambient light at each level. The difference between the two screen brightnesses must exceed a certain threshold. An ambient contrast ratio is then calculated from these ambient light measurements. The screen's projection settings are adjusted based on this ratio. The ambient light is continuously monitored, and if it changes significantly (exceeds a threshold), the contrast ratio is recalculated. If both the ambient light and the average screen brightness change significantly, the contrast ratio is recalculated considering both changes.
6. The method for adjustment of a projecting screen of claim 5 , wherein the step of adjusting the projecting setting of the projection unit according to the ambient contrast ratio comprises: determining a scenario according to the ambient contrast ratio, and adjusting the projecting setting of the projecting setting of the projection unit according to the scenario.
The method for adjusting a projecting screen, involving projecting at two brightness levels, calculating an ambient contrast ratio, and adjusting projecting settings, includes determining a display scenario (e.g., "dark room", "bright room") based on the calculated ambient contrast ratio. The projecting setting of the projection unit is then adjusted based on the determined scenario, selecting and applying pre-configured sets of projector settings (gamma, saturation, contrast) optimized for that scenario to improve projected image quality based on environmental conditions.
7. The method for adjustment of a projecting screen of claim 5 , wherein: the projecting setting of the projection unit comprises gamma, saturation and/or contrast ratio.
The method for adjusting a projecting screen, involving projecting at two brightness levels, calculating an ambient contrast ratio, and adjusting projecting settings, modifies the projector's image quality by changing at least one of these settings: gamma (adjusts brightness of midtones), saturation (adjusts color intensity), or contrast ratio (adjusts the difference between the brightest and darkest parts of the image). This provides a way to fine-tune the image characteristics to match ambient lighting conditions.
8. The method for adjustment of a projecting screen of claim 5 , wherein the step of re-calculating the ambient contrast ratio according to the monitored brightness value further comprises: obtaining a variation of an output brightness of the projection unit according to the variation of the average brightness and a gamma value of the projecting setting; and calculating to derive the ambient contrast ratio according to the variation of the output brightness and the monitored brightness value.
The method for adjusting a projecting screen by monitoring ambient light and re-calculating ambient contrast ratio based on brightness value differences, includes determining a change in the projector's light output using the change in average screen brightness and the projector's current gamma setting. The ambient contrast ratio is then recalculated using this calculated light output change and the current ambient light measurement. This allows for more accurate compensation for changes in both screen brightness and ambient light conditions, refining display optimization.
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June 16, 2015
September 19, 2017
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